extra slash in current path

[yuyichao-mit]

The problem is like this:

$ cd /
$ pwd
/

$ cd /
$ pwd
//

$ cd ///
$ pwd
/

Why can there be a extra slash (and exactly one) in current path? Is
this designed on purpose?
This is not really a big deal but I think it can confuse some program.

Thanks.

Yichao
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